I don't own any Mag pumps so I'm not clear on what you are trying to ask. I do own Rio pumps and my 2100+ came with 3/4" and 1" barb fittings. I use the 3/4" fitting for my 3/4" tubing I use as a return.
Ah ok lol. Then the answer to your question is no. On the Rio's, if you use the 3/4" barb, then you use 3/4" ID tubing. Same with the 1" barb, you use 1" ID tubing.
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